Possible Clues:

• Once they have been so light with us
• At once they make light of us
• Once they might make apound with us
• One might pound them together
• There are 12 in a pound
• Snow leopards - 16 of them in pound
• Twelfths of a pound
• There are16 to the pound
• They need us to pound them together once and for all
• There are 16 in a pound